refactor(assets): modular architecture + async two-phase scanner & background seeder (#12621)

tests-unit/assets_test/helpers.py

@@ -0,0 +1,28 @@
+"""Helper functions for assets integration tests."""
+import time
+
+import requests
+
+
+def trigger_sync_seed_assets(session: requests.Session, base_url: str) -> None:
+    """Force a synchronous sync/seed pass by calling the seed endpoint with wait=true.
+
+    Retries on 409 (already running) until the previous scan finishes.
+    """
+    deadline = time.monotonic() + 60
+    while True:
+        r = session.post(
+            base_url + "/api/assets/seed?wait=true",
+            json={"roots": ["models", "input", "output"]},
+            timeout=60,
+        )
+        if r.status_code != 409:
+            assert r.status_code == 200, f"seed endpoint returned {r.status_code}: {r.text}"
+            return
+        if time.monotonic() > deadline:
+            raise TimeoutError("seed endpoint stuck in 409 (already running)")
+        time.sleep(0.25)
+
+
+def get_asset_filename(asset_hash: str, extension: str) -> str:
+    return asset_hash.removeprefix("blake3:") + extension